Law / Company (Poland online store) not honoring warranty [3]

I bought a drone from DJI from an online store in Poland.
The drone was defective and after I have proved to them that it was defective they agreed to replace it.
However, one week later they seemed to have changed their mind and said it would not be covered under warranty.

I would like to know if there is any consumer protection entity in Poland that can help me, or do I need to get a lawyer to sue DJI?

Please advise,

Andre